Man-in-the-middle attack in php7 (Alpine package)

1) Man-in-the-middle attack

EUVDB-ID: #VU12256

Risk: Low

CVSSv3.1: 5.2 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2018-10548

CWE-ID: CWE-300 - Channel Accessible by Non-Endpoint ('Man-in-the-Middle')

Exploit availability: No

Description

The vulnerability allows a remote attacker to cause DoS condition on the target system.

The weakness exists in the ext/ldap/ldap.c source code file due to improper handling of return values from the ldap_get_dn function. A remote attacker can use man-in-the middle techniques to trigger ldap_get_dn() to return a NULL pointer and cause ldap_get_entries() because add_assoc_string() to crash.

Mitigation

Install update from vendor's website.

Vulnerable software versions

php7 (Alpine package): 7.0.7-r0 - 7.1.17-r0

External links

http://git.alpinelinux.org/aports/commit/?id=d42b915a2245405763bb485ededfbdb01393f109
http://git.alpinelinux.org/aports/commit/?id=797bba4604043977849b0c0cf0b2ef7b21b1ea8c
http://git.alpinelinux.org/aports/commit/?id=38460e57f1f299ba2454aa7869c699f1ab333ca1

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.